Welcome to the community. 
We do not have a trainer for the GOG version of this game, at this moment in time. We currently only have one for the Steam version.
However you can vote for one to be made for the GOG version via the WeMod desktop app.
Even though it’s the same game, there are slight differences in the game engine’s code depending on which store you purchase it from, which is why, for the most part, each store version needs their own trainer specifically designed for it.
As far as I’m aware, the game requires a 64-bit OS to run, so there are no 32-bit versions of this game. The error message is slightly misleading in your case for some reason. (Otherwise, the fix for that would be here: 32 bit and 64 bit).